Wang Sombun (Thai: วังสมบูรณ์, pronounced [wāŋ sǒm.būːn]) is a district (amphoe) in the southwestern part of Sa Kaeo province, eastern Thailand.

Neighbouring districts are (from the north clockwise) Wang Nam Yen and Khlong Hat of Sa Kaeo Province, Soi Dao and Kaeng Hang Maeo of Chanthaburi province, and Tha Takiap of Chachoengsao province.

The minor district (king amphoe) was established 1 July 1997 with three tambons split from Wang Nam Yen district.

[3] The district is divided into three sub-districts (tambons), which are further subdivided into 48 villages (mubans).

This Sa Kaeo Province location article is a stub.